WO2015174433A1 - 十字軸式自在継手用ヨーク - Google Patents
十字軸式自在継手用ヨーク Download PDFInfo
- Publication number
- WO2015174433A1 WO2015174433A1 PCT/JP2015/063696 JP2015063696W WO2015174433A1 WO 2015174433 A1 WO2015174433 A1 WO 2015174433A1 JP 2015063696 W JP2015063696 W JP 2015063696W WO 2015174433 A1 WO2015174433 A1 WO 2015174433A1
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- WIPO (PCT)
- Prior art keywords
- pair
- yoke
- central axis
- axial direction
- universal joint
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
- F16D3/26—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected
- F16D3/38—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another
- F16D3/382—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another constructional details of other than the intermediate member
- F16D3/387—Fork construction; Mounting of fork on shaft; Adapting shaft for mounting of fork
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
- F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
- F16D1/0852—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping between the mating surfaces of the hub and shaft
- F16D1/0864—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping between the mating surfaces of the hub and shaft due to tangential loading of the hub, e.g. a split hub
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
- F16D3/26—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
- F16D3/26—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected
- F16D3/38—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another
- F16D3/40—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another with intermediate member provided with two pairs of outwardly-directed trunnions on intersecting axes
- F16D3/41—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another with intermediate member provided with two pairs of outwardly-directed trunnions on intersecting axes with ball or roller bearings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/53—Split end with laterally movable opposed portions
- Y10T403/535—Split end with laterally movable opposed portions with separate force-applying means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/70—Interfitted members
- Y10T403/7026—Longitudinally splined or fluted rod
- Y10T403/7033—Longitudinally splined or fluted rod including a lock or retainer
Definitions
- the present invention relates to an improvement in a yoke constituting a cross-shaft universal joint (cardan joint) for connecting, for example, rotating shafts constituting a steering apparatus for an automobile so that torque can be transmitted.
- the steering device of an automobile is configured as shown in FIG.
- the movement of the steering wheel 1 operated by the driver is transmitted to the input shaft 6 of the steering gear unit 5 through the steering shaft 2, the universal joint 3, the intermediate shaft 4, and another universal joint 3.
- the rack and pinion mechanism built in the steering gear unit 5 pushes and pulls the pair of left and right tie rods 7 and 7 to provide an appropriate steering angle to the pair of left and right steering wheels according to the operation amount of the steering wheel 1.
- the intermediate shaft 4 is capable of transmitting torque by engaging one end portions of the outer shaft 8 and the inner shaft 9 with each other. The thing which comprised the shrinkage
- the universal joints 3 and 3 are coupled to the other end portions of the shafts 8 and 9.
- a cross shaft type universal joint as described in Patent Document 1 As the universal joints 3 and 3 incorporated in such a steering apparatus, for example, a cross shaft type universal joint as described in Patent Document 1 is used.
- the yoke 10 having a conventional structure is a so-called press yoke obtained by sequentially performing a stamping process and a bending process by pressing a metal plate such as a steel material, and includes a base 11 and a pair of connecting arm portions 12 and 12.
- the base portion 11 is in a cylindrical shape, and is provided with a discontinuous portion (slit) 13 for allowing the inner diameter of the base portion 11 to be enlarged or reduced at one place in the circumferential direction.
- the base 11 is provided with first and second flange portions 14 and 15 with the discontinuous portion 13 sandwiched from both sides in the circumferential direction.
- a female serration 16 is formed on the inner peripheral surface of the base portion 11.
- the first and second flange portions 14 and 15 have a thickness dimension corresponding to two metal plates by folding the metal plate.
- a through hole 17 and a screw hole 18 are formed in relation to a twisted position with respect to the central axis of the base portion 11.
- the first and second flange portions 14 and 15 are substantially parallel to each other, and the through hole 17 and the screw hole 18 are disposed concentrically with each other.
- the coupling arm portions 12 and 12 are provided so as to extend in the axial direction from two positions on the diametrically opposite side with respect to the base portion 11 in one axial end edge (the upper end edge in FIG. 14) of the base portion 11. Yes. Further, the arrangement direction of the coupling arm portions 12 and 12 (the left-right direction in FIGS. 14 and 15) and the arrangement direction of the first and second flange portions 14 and 15 (the left-right direction in FIG. 15) are the circumferential direction. With respect to each other (arranged in parallel). Further, concentric circular holes 19 and 19 are formed at the distal ends of the coupling arm portions 12 and 12. The central axes of the circular holes 19 and 19 and the central axes of the through hole 17 and the screw hole 18 are arranged in parallel to each other.
- the yoke 10 having the above-described configuration is made of a flat base plate 22 having a substrate portion 20 and a pair of tongue-like portions 21 and 21 as shown in FIG.
- First, the both end portions of the substrate portion 20 of the base plate 22 are folded back 180 degrees at the intermediate portions, thereby forming the first intermediate material 23 as shown in FIG.
- the first intermediate material 23 is pressed between a pair of pressing dies to be plastically deformed to form a second intermediate material 24 as shown in FIG.
- the tongue-like portions 21 and 21 to be the pair of connecting arm portions 12 and 12 are curved in a partial cylindrical shape, and the proximal portions of the tongue-like portions 21 and 21 are substantially cranked.
- the tongue part 21, the intermediate part or the tip end part of the tongue part 21, 21 is offset with respect to the substrate part 20.
- the central portion of the substrate portion 20 is slightly curved to form a third intermediate material 25 as shown in FIG.
- the substrate portion 20 of the third intermediate material 25 is further curved to form a fourth intermediate material 26 as shown in FIG.
- the base 11 and the pair of connecting arm portions 12 and 12 provided in the completed yoke 10 are formed.
- through holes 17 and screw holes 18 are formed in the first and second flange portions 14 and 15 constituting the base portion 11, female serrations 16 are formed on the inner peripheral surface of the base portion 11, and circular holes are formed in the coupling arm portions 12 and 12. 19 and 19 are formed to obtain the yoke 10 as shown in FIGS.
- the cup bearings 29 and 29 correspond to shell-type needle bearings, respectively, and include bottomed cylindrical cups 30 and 30 corresponding to shell-type outer rings and a plurality of needles 31 and 31.
- Such cup bearings 29 and 29 are assembled in such a manner that the needles 31 and 31 are arranged along the inner peripheral surface in a state where the shaft portion 28a of the cross shaft 27 is inserted into the circular holes 19 and 19, respectively.
- 30 and 30 are performed by press-fitting into the respective circular holes 19 and 19 from the opening on the outer surface side of the coupling arm portions 12 and 12.
- both end portions of the shaft portion 28a are rotatably supported with respect to the yoke 10.
- the inner peripheral surface of each cup 30, 30 functions as an outer ring raceway of the cup bearings 29, 29, and the outer peripheral surface of the shaft portion 28a functions as an inner ring raceway of the cup bearings 29, 29.
- the base 11 of the yoke 10 is connected to the end of the rotary shaft, which is one of the steering shaft 2, the intermediate shaft 4, and the input shaft 6 (see FIG. 12).
- the end portion of the rotating shaft is inserted inside the center hole (serration hole) of the base portion 11 in the free state of the yoke 10.
- the female serration 16 formed on the inner peripheral surface of the base portion 11 and the male serration provided on the outer peripheral surface of the end portion of the rotating shaft are engaged with each other.
- the bolt 32 is inserted into the through hole 17, screwed into the screw hole 18, and further tightened.
- the base 11 is elastically reduced in diameter.
- the surface pressure of the serration engaging portion increases, and the base portion 11 is coupled and fixed to the end portion of the rotating shaft so as to transmit torque.
- the end portion of the shaft portion 28a configuring the cross shaft 27 configures the cup bearings 29 and 29 for reasons such as securing the workability of assembling the cup bearings 29 and 29.
- the needles 31, 31 are inserted in a state having a certain gap inside in the radial direction. For this reason, at the time of use, the end portion of the shaft portion 28a may rattle in the radial direction (radial direction) with respect to the cup bearings 29 and 29, and may generate abnormal noise. Also, such rattling can become excessive with long-term use.
- Patent Document 2 discloses that a joint between a cup bearing and a cross shaft is formed by plastically deforming a peripheral portion of a circular hole into which a cup bearing is press-fitted among coupling arm portions constituting a yoke.
- the invention which suppresses generation
- Patent Document 3 discloses an invention that suppresses the occurrence of rattling between the cup bearing and the shaft portion of the cross shaft by devising the shape of the cup constituting the cup bearing (deforming the cylindrical portion).
- any of the inventions described in Patent Documents 2 and 3 dedicated processing is required for the connecting arm portion or the cup in order to suppress the occurrence of rattling.
- the present invention can suppress rattling between the bearing incorporated inside the circular hole and the end of the shaft portion of the cross shaft that is rotatably supported by this bearing.
- This invention was invented to realize a cross-shaft type universal joint yoke at a low cost.
- the cross shaft type universal joint yoke of the present invention is A base for coupling and fixing the end of the rotating shaft, and a pair of coupling arms extending in the axial direction from two positions on the diametrically opposite side of the base, of one end edge in the axial direction of the base; With A pair of circular holes for pivotally supporting the end of the shaft portion constituting the cross shaft via a bearing are formed concentrically at the distal end portion of the coupling arm portion,
- the base portion is a portion between the pair of coupled arm portions in the circumferential direction, and a non-circular cylinder having a discontinuous portion at one position that is 90 degrees out of phase in the circumferential direction with respect to the pair of coupled arm portions.
- a pair of flange portions formed on both sides of the discontinuous portion, and a pair of mounting holes are formed in the matching portions of the pair of flange portions.
- the bearing is not limited to a cup bearing (shell needle bearing), and various bearings such as a sliding bearing can be employed.
- the pair of mounting holes are formed in directions in which the respective central axes are inclined with respect to the central axis of the pair of circular holes. For this reason, a fastening member such as a bolt is inserted into the pair of mounting holes, the fastening member is tightened, and the pair of flange portions are connected to each other so that the end of the rotary shaft can be fixed inside the base portion. In a state where they are close to each other, the central axis of the fastening member is inclined with respect to the central axis of the pair of circular holes.
- the pair of circular holes are formed with respect to the pair of coupling arm portions. A force in a direction inclined with respect to the central axis and in a direction approaching each other is applied.
- the axial direction of the central axis of the pair of mounting holes is a pair of circular holes. It is inclined relative to the axial direction of the central axis.
- the axial direction of the center axis of the pair of mounting holes is a pair of It is inclined relative to the axial direction of the central axis of the circular hole.
- the discontinuous portion is perpendicular to the central axis of the pair of mounting holes, and the axial direction of the base portion. Is inclined.
- the mounting hole formed in one flange portion of the pair of flange portions is used as the through hole and the other flange portion is used.
- the attachment hole formed in the part is a screw hole.
- the yoke for a cross shaft type universal joint of the present invention configured as described above, between the bearing incorporated inside the circular hole and the end of the shaft portion of the cross shaft rotatably supported by the bearing.
- a structure that can suppress rattling can be realized at low cost. That is, in the case of the present invention, the center axis of the pair of mounting holes formed in the pair of flange portions is inclined with respect to the center axis of the pair of circular holes formed in the pair of coupling arm portions, respectively.
- a dedicated process for suppressing such rattling is not required, so that the yoke for the cross shaft universal joint, and further, for the cross shaft universal joint of the present invention is used.
- the machining cost of the cross shaft type universal joint including the yoke can be reduced, and the cost can be reduced.
- the end elevation which shows the state which looked at the yoke of FIG. 1 from the downward direction.
- the partial cutting side view which shows the state which incorporated the cup bearing in the yoke and supported the cross shaft.
- the figure equivalent to the VI-VI cross section of FIG. 4 which shows the state which incorporated the cup bearing in the yoke and supported the cross shaft.
- the side view which shows the yoke of a conventional structure.
- the end elevation which shows the state which looked at the yoke of FIG. 14 from the downward direction.
- the schematic diagram which shows the manufacturing method of the yoke of FIG. 14 of conventional structure in order of a process.
- the figure equivalent to FIG. 14 which shows the state which built the cup bearing in the yoke and supported the cross shaft.
- the figure equivalent to FIG. 15 which shows the state which fastened the bolt to the yoke.
- FIGS. 14 to 19 show a cross shaft type universal joint yoke according to a first embodiment of the present invention.
- the cross-axis universal joint yoke of the present invention including this embodiment is characterized in that the central axes of the through holes 17a and the screw holes 18a formed in the first and second flange portions 14a and 15a are respectively 1 It is in the point which made it incline with respect to the central axis of the circular holes 19a and 19a each formed in the pair of coupling arm parts 12a and 12a. Since the structure and operation of the other parts are the same as those of the conventional structure shown in FIGS. 14 to 19 described above, the same parts are denoted by the same reference numerals, and redundant description is omitted or simplified. The description will focus on the features of the present embodiment.
- the yoke 10a of the present embodiment is a so-called press yoke that is formed by sequentially punching and bending a metal plate such as a steel material by a press.
- the yoke 10a extends in the axial direction from two positions on the diametrically opposite side with respect to the base 11a among the base 11a and one axial end edge (the upper end edge in FIGS. 1 and 3) of the base 11a.
- a pair of connecting arm portions 12a and 12a provided.
- a pair of circular holes 19a, 19a formed concentrically with each other and in the thickness direction of the coupling arm portions 12a, 12a are provided at the distal ends of the coupling arm portions 12a, 12a.
- the base portion 11a penetrates in the axial direction at one location that is 90 degrees out of phase in the circumferential direction with respect to the coupling arm portions 12a and 12a at the portion between the coupling arm portions 12a and 12a in the circumferential direction. It is formed in the shape of a hollow cylinder having the discontinuous part 13.
- the base portion 11a includes first and second flange portions 14a and 15a at positions where the discontinuous portion 13 is sandwiched from both sides in the circumferential direction.
- the first and second flange portions 14a and 15a have a thickness dimension corresponding to two metal plates by folding the metal plate, and the arrangement direction of the first and second flange portions 14a and 15a is
- the connecting arm portions 12a and 12a coincide with the direction of arrangement.
- a through hole 17a and a screw hole 18a are formed concentrically with each other at positions where the first and second flange portions 14a and 15a are aligned with each other.
- the through hole 17a and the screw hole 18a are formed in a direction inclined with respect to the central axis of the circular holes 19a, 19a.
- the central axis of the through hole 17a and the screw hole 18a is set to 5 degrees to 45 degrees in the axial direction of the base portion 11a (vertical direction in FIGS. 1 and 3) with respect to the central axis of the circular holes 19a and 19a.
- the yoke is in the side surface direction (the direction perpendicular to the paper surface shown in FIG. 1, that is, the surface that passes through the central axis of the base portion 11b and is 90 degrees out of phase in the circumferential direction with respect to the pair of coupling arm portions 12a and 12a.
- the axial direction Y1 of the central axis of the through hole 17a and the screw hole 18a is relatively inclined with respect to the axial direction X1 of the central axis of the pair of circular holes 19 and 19 as viewed from the direction along the axial direction).
- the axial direction Y1 of the central axis of the through hole 17a and the screw hole 18a and the axial direction X1 of the central axis of the pair of circular holes 19 and 19 are not parallel to each other).
- the angle (inclination angle) between the central axis of the through hole 17a and the screw hole 18a and the central axis of the circular holes 19a, 19a is the shape of the yoke 10a (particularly, the rigidity of the coupling arm portions 12a, 12a). And it can determine suitably based on the magnitude
- the cup bearings 29 and 29 correspond to shell-type needle bearings, respectively, and include bottomed cylindrical cups 30 and 30 corresponding to shell-type outer rings and a plurality of needles 31 and 31.
- the cup 30 is formed by bending a hard metal plate such as a carbon steel plate or a case-hardened steel plate by plastic processing such as deep drawing, and includes a cylindrical portion 33, a bottom portion 34, and an inward flange portion 35. Of these, the bottom 34 closes the whole axial one end side of the cylindrical portion 33 (the outer surface side of the connecting arm portion 12 in the assembled state in the circular hole 19a).
- the inward flange portion 35 is provided in a state of being bent radially inward from the other axial end side of the cylindrical portion 33 (in the assembled state in the circular hole 19a, the inner side surface side of the coupling arm portion 12a). .
- the cups 30 and 30 having the above-described configuration are press-fitted inside the circular holes 19a and 19a, and the openings of the circular holes 19a and 19a are formed on the outer surfaces of the coupling arm portions 12a and 12a.
- the edge portion is plastically deformed radially inward to form a caulking portion (not shown) to prevent the cups 30 and 30 from coming out of the circular holes 19a and 19a outward.
- both end portions of the shaft portion 28a constituting the cross shaft 27 are inserted into the inner sides in the radial direction of the needles 31 and 31, respectively.
- both end portions of the shaft portion 28a are rotatably supported with respect to the yoke 10a.
- the end portion of the shaft portion 28a can be inserted in a state having a certain gap inside the needles 31 and 31 in the radial direction. For this reason, the assembling workability of the cup bearings 29 and 29 is not lowered.
- the inside of the center hole (serration hole) of the base portion 11a in the free state of the yoke 10a inserts the end of the rotating shaft.
- the female serration 16 formed on the inner peripheral surface of the base portion 11a and the male serration provided on the outer peripheral surface of the end portion of the rotating shaft are engaged with each other.
- a bolt (bolt with a circular seat) 32 is inserted into the through hole 17a, screwed into the screw hole 18a, and further tightened.
- the base 11a is elastically reduced in diameter based on elastically narrowing the width of the discontinuous portion 13 (making the first flange portion 14a and the second flange portion 15a closer to each other).
- the surface pressure of the serration engaging portion increases, and the base portion 11a is coupled and fixed to the end portion of the rotating shaft so that torque can be transmitted.
- the central axes of the through holes 17a and the screw holes 18a are inclined with respect to the central axes of the circular holes 19a and 19a. It will be in the state inclined with respect to the central axis of the circular holes 19a and 19a.
- the cup bearings 29 and 29 incorporated inside the circular holes 19a and 19a and the cup bearings 29 and 29 are rotatably supported.
- a structure that can suppress rattling between the end portions of the shaft portion 28a of the cross shaft 27 can be realized at low cost.
- the center axes of the through holes 17a and the screw holes 18a formed in the first and second flange portions 14a and 15a are respectively circular holes 19a and 12a and 12a formed in the coupling arm portions 12a and 12a, respectively. It inclines with respect to the central axis of 19a. Therefore, by tightening the bolt 32 and bringing the first and second flange portions 14a and 15a closer to each other, the circular holes 19a and 19a as shown by the thick arrows in FIG. A force in a direction inclined toward the axial direction of the base portion 11a with respect to the central axis and in a direction approaching each other can be applied.
- the radially inner side surface of the needle 31 positioned above FIG. 3 is connected to the end of the shaft portion 28a. 3 and presses the outer peripheral surface of the left end of FIG. 3 from the top to the bottom, and out of the needles 31 and 31 constituting the cup bearing 29 provided on the right side of FIG.
- the radially inner side surface of the needle 31 is pressed against the outer peripheral surface of the right end portion in FIG. 3 from both ends of the shaft portion 28a from below to above.
- a radial direction is provided between the cup bearings 29, 29 incorporated inside the circular holes 19a, 19a and both end portions of the shaft portion 28a constituting the cross shaft 27 inserted inside the cup bearings 29, 29. It is possible to prevent the formation of the gap. Therefore, it is possible to suppress the occurrence of rattling between the cup bearings 29 and 29 and both end portions of the shaft portion 28a.
- a structure capable of obtaining such an effect can be realized only by changing the formation direction of the through holes 17a and the screw holes 18a. There is no need for special processing to suppress rattling, as in the case. For this reason, the processing cost of the yoke 10a of this embodiment and by extension, the cross shaft type universal joint comprised including the yoke 10a of this embodiment can be suppressed, and cost reduction can be achieved.
- FIG. 5 the axial direction Y1 of the central axis of the through hole 17b and the screw hole 18b is 1 as viewed from the axial direction of the rotating shaft (the central axis direction of the base portion 11b).
- the pair of circular holes 19, 19 are inclined relative to the axial direction X1 of the central axis.
- the central axes of the through holes 17b and the screw holes 18b formed in the first and second flange portions 14b and 15b of the base portion 11b are respectively the circular holes 19a and 19a formed in the pair of connecting arm portions 12a and 12a. Inclined in the direction in which the discontinuous portion 13 of the base portion 11b is formed (the radial direction of the base portion 11b) with respect to the central axis (parallel to the central axis of the base portion 11b and the center of the through hole 17b and the screw hole 18b) Inclines around an imaginary line through the axis).
- the axial direction X1 of the central axis of the pair of circular holes 19 and 19 coincides with the circumferential intermediate position of the pair of coupling arm portions 12a and 12a.
- the bolt 32 is inserted into the through hole 17b, screwed into the screw hole 18b, further tightened, and the first and second flange portions 14b and 15b are brought close to each other, thereby connecting the coupling arm portions 12a and 12a.
- a force in a direction inclined toward the formation direction of the discontinuous portion 13 and a direction approaching each other is applied to the central axis of the circular holes 19a, 19a. Can do.
- FIG. 7 and 8 show a cross shaft type universal joint yoke according to a third embodiment of the present invention.
- the axial direction Y1 of the central axis of the through-hole 17 and the screw hole 18 formed in the first and second flange portions 14 and 15 is the same as the first and second flange portions 14 and 15.
- the axial direction X1 of the central axis of the circular holes 19b and 19b formed in the pair of coupling arm portions 12b and 12b is the axis of the base 11 with respect to the arrangement direction of the pair of coupling arm portions 12b and 12b.
- the circular holes 19 b and 19 b are formed so that the respective central axes are inclined in the axial direction of the base 11 with respect to the central axes of the through hole 17 and the screw hole 18.
- the bolt 32 is inserted into the through hole 17, screwed into the screw hole 18, and further tightened to connect the first and second flange portions 14 and 15 together.
- [Fourth Embodiment] 9 and 10 show an example of a cross shaft type universal joint yoke according to a fourth embodiment of the present invention. Also in the case of the yoke 10d of the present embodiment, the central axes of the through holes 17 and the screw holes 18 formed in the first and second flange portions 14 and 15 are the arrangement directions of the first and second flange portions 14 and 15, respectively. It is formed along the direction of expansion / contraction of the discontinuous portion 13.
- the axial direction X1 of the central axis of the through hole 17b and the screw hole 18b is inclined with respect to the axial direction Y1 of the central axis of the circular holes 19c and 19c when viewed from the axial direction of the rotating shaft.
- the positional relationship is such that the central axis X1 of the circular holes 19c, 19c viewed from the axial direction of the rotation shaft is circular from the circumferential intermediate position of the pair of coupling arm portions 12c, 12c. It is given by shifting in the circumferential direction.
- the bolt 32 is inserted into the through hole 17, screwed into the screw hole 18, and further tightened so that the first and second flange portions 14 and 15 are connected to each other.
- the gap between the cup bearings 29 and 29 incorporated inside the circular holes 19c and 19c and the end portion of the shaft portion 28a of the cross shaft 27 rotatably supported by the cup bearings 29 and 29 is increased. The occurrence of sticking can be suppressed.
- this invention is not limited to embodiment mentioned above, A deformation
- the discontinuous portion 13a sandwiched between the first and second flange portions 14a and 15a is perpendicular to the central axes of the through hole 17b and the screw hole 18b.
- the base portion 11a may be inclined with respect to the axial direction.
- the mounting holes formed in the pair of flange portions are not limited to the structure in which one is a through hole and the other is a screw hole as in the above-described embodiments.
- the mounting holes formed in the pair of flange portions are not limited to the structure in which one is a through hole and the other is a screw hole as in the above-described embodiments.
- the thickness dimension of a flange part is not limited to the thickness dimension for two sheets of the metal plate used as a raw material.
- the bearing incorporated inside the circular hole formed at the tip of the coupling arm is not limited to the cup bearing (shell type needle bearing), and various types such as a sliding bearing having a shape in which the needle is omitted from the cup bearing. Can be used.
- the manufacturing method of the universal joint yoke of the present invention is not limited to the same method as the manufacturing method of the yoke having the conventional structure, and other various methods can be employed in addition to adding or omitting another process.
- the present invention is not limited to the press yoke, but can be applied to a forged yoke.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Steering Controls (AREA)
- Forging (AREA)
- Axle Suspensions And Sidecars For Cycles (AREA)
- Steering Devices For Bicycles And Motorcycles (AREA)
Abstract
Description
尚、図14~19に示した従来構造の場合には、通孔17及びねじ孔18の中心軸と、円孔19、19の中心軸との、円周方向に関する位相が一致している(互いに平行に配置されている)。この為、ボルト32の締め付けにより、第一、第二フランジ部14、15同士を互いに近づける方向に変形させた場合にも、図19に太矢印で示した様に、結合腕部12、12は、円孔19、19の軸方向で且つ互いに近づく方向に撓み変形するだけで、上述の様ながたつきを軽減できる様な変形は生じない。
回転軸の端部を結合固定する為の基部と、該基部の軸方向一端縁のうちで、前記基部に関する直径方向反対側2箇所位置から軸方向に延出した1対の結合腕部と、
を備え、
前記結合腕部の先端部には、十字軸を構成する軸部の端部を軸受を介して枢支する為の1対の円孔が互いに同心に形成され、
前記基部は、円周方向に関して前記1対の結合腕部同士の間部分で、前記1対の結合腕部に対し円周方向に90度位相がずれた1箇所に不連続部を有する欠円筒状であって、該不連続部を挟んで形成された1対のフランジ部を有し、前記1対のフランジ部の互いに整合する部分に1対の取付孔が形成される。
尚、前記軸受は、カップ軸受(シェル型ニードル軸受)に限らず、滑り軸受等の各種の軸受を採用できる。
そして、前記基部の内側で前記回転軸の端部を固定可能な寸法にまで前記1対のフランジ部同士を互いに近づける事により、前記1対の結合腕部に対し、前記1対の円孔の中心軸に対して傾斜した方向で、且つ、互いに近づき合う方向の力を作用させる。
又、上述の様な本発明の十字軸式自在継手用ヨークを実施する場合には、例えば、回転軸の軸方向から見て、1対の取付孔の中心軸の軸方向は、1対の円孔の中心軸の軸方向に対して相対的に傾斜している。
即ち、本発明の場合には、1対のフランジ部にそれぞれ形成した1対の取付孔の中心軸を、1対の結合腕部にそれぞれ形成した1対の円孔の中心軸に対して傾斜させている為、1対の取付孔を挿通したボルト等の締結部材を締め付け、1対のフランジ部同士を互いに近づける事により、1対の結合腕部に対し、1対の円孔の中心軸に対して傾斜した方向で、且つ、互いに近づき合う方向の力を作用させる事ができる。この為、1対の円孔の内側に組み込まれる軸受と、この軸受の内側に挿入される十字軸を構成する軸部の端部との間に、ラジアル方向の隙間が形成される事を防止できる。従って、軸受とこの軸部の端部との間にがたつきが発生する事を抑制できる。しかも、本発明の場合には、この様ながたつきを抑制する為の専用の加工が不要である為、十字軸式自在継手用ヨーク、延いては、本発明の十字軸式自在継手用ヨークを含んで構成される十字軸式自在継手の加工コストを抑えられ、低コスト化を図れる。
図1~3は、本発明の第1実施形態の十字軸式自在継手用ヨークを示している。尚、本実施形態を含めて、本発明の十字軸式自在継手用ヨークの特徴は、第一、第二フランジ部14a、15aにそれぞれ形成した通孔17a及びねじ孔18aの中心軸を、1対の結合腕部12a、12aにそれぞれ形成した円孔19a、19aの中心軸に対して傾斜させた点にある。その他の部分の構造及び作用は、前述の図14~19に示した従来構造の場合と同様であるから、同等部分には同一符号を付して、重複する説明を省略若しくは簡略にし、以下、本実施形態の特徴部分を中心に説明する。
尚、通孔17a及びねじ孔18aの中心軸と、円孔19a、19aの中心軸とのなす角度(傾斜角度)は、ヨーク10aの形状(特に結合腕部12a、12aの剛性の大きさ)、及び、後述するカップ軸受29と軸部28aの端部とのラジアル隙間の大きさ等に基づき、適宜決定する事ができる。
図4~6は、本発明の第2実施形態の十字軸式自在継手用ヨークを示している。本実施形態のヨーク10bの場合、図5に示すように、回転軸の軸方向(基部11bの中心軸方向)から見て、通孔17b及びねじ孔18bの中心軸の軸方向Y1が、1対の円孔19、19の中心軸の軸方向X1に対して相対的に傾斜している。即ち、基部11bの第一、第二フランジ部14b、15bにそれぞれ形成した通孔17b及びねじ孔18bの中心軸が、1対の結合腕部12a、12aにそれぞれ形成した円孔19a、19aの中心軸に対して、基部11bの不連続部13の形成方向(この基部11bの径方向)に傾斜している(基部11bの中心軸と平行で、且つ、通孔17b及びねじ孔18bの中心軸を通る仮想線回りに傾斜している)。なお、本実施形態では、1対の円孔19、19の中心軸の軸方向X1は、1対の結合腕部12a、12aの円周方向中間位置と一致している。
この為、ボルト32を、通孔17bに挿通すると共に、ねじ孔18bに螺合し、更に締め付け、第一、第二フランジ部14b、15b同士を互いに近づける事により、結合腕部12a、12aに対し、図5に太矢印で示した様な、円孔19a、19aの中心軸に対して、不連続部13の形成方向に傾斜した方向で、且つ、互いに近づき合う方向の力を作用させる事ができる。
その他の部分の構成及び作用に就いては、上述した第1実施形態のものと同様である。
図7及び図8は本発明の第3実施形態の十字軸式自在継手用ヨークを示している。本実施形態のヨーク10cの場合、第一、第二フランジ部14、15にそれぞれ形成した通孔17及びねじ孔18の中心軸の軸方向Y1は、第一、第二フランジ部14、15同士の配列方向(不連続部13の拡縮方向)に沿うように形成されている。一方、1対の結合腕部12b、12bにそれぞれ形成した円孔19b、19bの中心軸の軸方向X1は、1対の結合腕部12b、12b同士の配列方向に対して、基部11の軸方向(図7の上下方向)に傾斜させている。したがって、円孔19b、19bは、それぞれの中心軸が、通孔17及びねじ孔18の中心軸に対して、基部11の軸方向に傾斜した方向になるように形成されている。
図9及び図10は本発明の第4実施形態の十字軸式自在継手用ヨークの一例を示している。本実施形態のヨーク10dの場合も、第一、第二フランジ部14、15にそれぞれ形成した通孔17及びねじ孔18の中心軸は、第一、第二フランジ部14、15同士の配列方向(不連続部13の拡縮方向)に沿うように形成されている。
例えば、図11に示す変形例のヨーク10a´のように、第一、第二フランジ部14a、15aに挟まれる不連続部13aが、通孔17b及びねじ孔18bの中心軸と直交する形で、基部11aの軸方向に対して傾斜していてもよい。
2 ステアリングシャフト
3 自在継手
4 中間シャフト
5 ステアリングギヤユニット
6 入力軸
7 タイロッド
8 アウタシャフト
9 インナシャフト
10、10a、10b、10c、10d ヨーク
11、11a、11b 基部
12、12a、12b、12c 結合腕部
13、13a 不連続部(スリット)
14、14a、14b 第一フランジ部
15、15a、15b 第二フランジ部
16 雌セレーション
17、17a、17b 通孔
18、18a、18b ねじ孔
19、19a、19b、19c 円孔
20 基板部
21 舌状部
22 素板
23 第一中間素材
24 第二中間素材
25 第三中間素材
26 第四中間素材
27 十字軸
28a、28b 軸部
29 カップ軸受
30 カップ
31 ニードル
32 ボルト
33 円筒部
34 底部
35 内向鍔部
Claims (5)
- 回転軸の端部を結合固定する為の基部と、該基部の軸方向一端縁のうちで、前記基部に関する直径方向反対側2箇所位置から軸方向に延出した1対の結合腕部と、
を備え、
前記結合腕部の先端部には、十字軸を構成する軸部の端部を軸受を介して枢支する為の1対の円孔が互いに同心に形成され、
前記基部は、円周方向に関して前記1対の結合腕部同士の間部分で、前記1対の結合腕部に対し円周方向に90度位相がずれた1箇所に不連続部を有する欠円筒状であって、該不連続部を挟んで形成された1対のフランジ部を有し、前記1対のフランジ部の互いに整合する部分に1対の取付孔が形成される、
十字軸式自在継手用ヨークであって、
前記1対の取付孔が、それぞれの中心軸が前記1対の円孔の中心軸に対して傾斜した方向に形成されており、前記基部の内側で前記回転軸の端部を固定可能な寸法にまで前記1対のフランジ部同士を互いに近づける事により、前記1対の結合腕部に対し、前記1対の円孔の中心軸に対して傾斜した方向で、且つ、互いに近づき合う方向の力を作用させる事を特徴とする十字軸式自在継手用ヨーク。 - 前記ヨークを側面方向から見て、前記1対の取付孔の中心軸の軸方向は、前記1対の円孔の中心軸の軸方向に対して相対的に傾斜している、請求項1に記載の十字軸式自在継手用ヨーク。
- 前記回転軸の軸方向から見て、前記1対の取付孔の中心軸の軸方向は、前記1対の円孔の中心軸の軸方向に対して相対的に傾斜している、請求項1に記載の十字軸式自在継手用ヨーク。
- 前記不連続部は、前記1対の取付孔の中心軸と直交する形で、前記基部の軸方向に対して傾斜している、請求項2に記載の十字軸式自在継手用ヨーク。
- 前記1対のフランジ部のうち、一方のフランジ部に形成された取付孔が通孔であり、他方のフランジ部に形成された取付孔がねじ孔である、請求項1~4のいずれか1項に記載した十字軸式自在継手用ヨーク。
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